This can be done by a handiman or diy.
Shower floor tile liner.
Instructional video on installing a pvc pan liner for a tiled shower pan.
Mix cement with just enough water to get it to hold shape.
The only time a shower works with no liner is if it is on a concrete floor and the tile is laid directly on the floor so that any overflow would drain directly into the room and could not build up any static head pressure and even then there is a possibility of leakage where the walls meet the floor.
It is very important to follow all steps as.
This type of floor must be graded slightly toward the center drain.
A shower pan is made up of mortar or mud a waterproof liner felt paper tile backing thinset tile and grout.
This article explains how shower pans liners are installed incorrectly by plumbers tile setters and inspectors.
If building on a plywood surface you must first lay down a layer of felt paper isolates concrete from floor movement.
On floor installations.
Once in position carefully take a utility knife and cut x s on the heads of each of the 4 bolts and slide the liner over the bolts.
Then staple down a layer of metal lath.
Remove the upper half of the drain and install pvc pan liner available at home improvement and tile stores.
Remove the top flange of the drain if it is still installed and thread the 4 bolts into the bottom flange.
Use galvanized roofing nails to nail the liner at least 12 up the walls surrounding the shower pan.
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Nominal 68mm tray height including aluminium perimeter profile with 4mm 10mm step down depending on the tile thickness used wall liner specialised high impact plasticised wall liners two or three.
The author then explains how shower pan liners should properly be installed to avoid removal replacement.
You should already have the shower curb formed with 3 2x4s stacked on top of each other and fastened securely to the floor.
Ensure that your shower drain has been installed in the proper location with the lower half supported flush with the sub floor.
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This is the most traditional shower floor construction but it is also the most complicated labor intensive and heaviest type of shower pan to build.